the president and governor romney face off about how to stop a nuclear iran. and this just in, barbara walters here tonight on what president and mrs. obama just said to her about life after the white house. >>> a new hope for breast cancer. is this mysterious clue the answer for tens of thousands of women? >>> the kennedy tapes. tonight, hidden tape recordings of a fully human president, angry, probing, a little girl under his desk now all grown up telling you the biggest thing she learned about her father. an abc news exclusive. >>> and family reunion? everyone who thought they were stealing the show at the emmys last night, were put under by a tiny gladiator from our "modern family". today, she show us what she's really like. >>> good evening. as we come on the air, president obama and republican presidential candidate mitt romney are in a duel over war and peace. 43 days before "your voice, your vote" the question is this, how does the united states stop iran from getting a nuclear weapon and taunting both of the candidates from the sidelines, the presiden